package com.example.validatestudy.demos.tread;

import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;


@Slf4j
@Configuration
@EnableAsync
public class ExecutorConfig {
    /**
     * Spring自带的线程池
     * @return
     */
    @Bean
    public ThreadPoolTaskExecutor asyncServiceExecutor() {
        int processors = Runtime.getRuntime().availableProcessors();

        log.info("当前计算机核数 = {}", processors);
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //配置核心线程数
        executor.setCorePoolSize(processors + 1);
        //配置最大线程数
        executor.setMaxPoolSize(processors + 1);
        //配置队列大小
        executor.setQueueCapacity(64);
        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix("async-service-");
        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        //执行初始化
        executor.initialize();
        return executor;
    }
}